After 25 years, the Tri-State Fertilizer Recommendations for Corn, Soybeans, Wheat, and Alfalfa has been comprehensively updated and is now available. The full version can be downloaded as a free pdf, or a printed copy can be purchased through the extension office or online at https://extensionpubs.osu.edu/search.php?search_query=974§ion=product
A summarized version of findings can be found here: go.osu.edu/fert-recs
The recommendations are based on more than a decade of field trials evaluating N, P, K, S and micronutrients, including over 300 on-farm trials across 41 Ohio counties. This work confirms that the original Tri-State recommendations provided sound guidelines for nutrient management. However, some changes in the recommendations have been made to keep pace with contemporary practices in Ohio’s field crops. This new guide provides an objective framework for farmers to manage nutrients as judiciously and profitably as possible.
Red counties reflect the Ohio counties where fertilizer trials were conducted (2014 – 2018)